🔇 Discard expected navigator.locks errors from page teardown

[thomas-lebeau]

Motivation

In-flight navigator.locks.request callbacks reject when the browsing context is torn down. These rejections aren't actionable — the page is going away — but they were being forwarded to telemetry as errors, generating noise. The investigation telemetry added in #4668 confirmed the cause; this PR acts on those findings.

Changes

• sessionInCookie.ts: catch and discard the two error shapes seen in the wild:

  • WebKit: AbortError: Promise was rejected because the browsing context is going away
  • Chromium: Error: Failed to execute 'request' on 'LockManager': The provided callback is no longer runnable.

  All other lock rejections still propagate.

• Remove the addTelemetryError call on lock-request failures along with the supporting helpers that only existed to enrich its context: buildLockErrorContext, queryLockSnapshot, getNavigationType, isInIframe, the LockQuerySnapshot interface, the LOCK_QUERY_TIMEOUT constant, and the initTimestamp / lockRequestedAt bookkeeping.

• Delete the lifecycleTracker module (lifecycleTracker.ts + spec). Its only consumer was buildLockErrorContext; with that gone, startLifecycleTracker was registering capture-phase listeners on pageshow / pagehide / visibilitychange / freeze / resume / beforeunload / prerenderingchange only to record state nobody read. The startLifecycleTracker(configuration) and resetLifecycleTracker() calls in sessionManager.ts (and the corresponding test cleanup) are dropped.

Test instructions

• yarn typecheck and yarn lint pass.
• yarn test:unit --spec packages/core/src/domain/session/storeStrategies/sessionInCookie.spec.ts
• yarn test:unit --spec packages/core/src/domain/session/sessionManager.spec.ts
• After deploy, the session-lock-error telemetry monitors should stop firing for the two known teardown signatures while still capturing any genuinely unexpected lock failures.

Checklist

• Tested locally
• Tested on staging
• Added unit tests for this change.
• Added e2e/integration tests for this change.
• Updated documentation and/or relevant AGENTS.md file

[datadog-prod-us1-6]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 0.00%
• Overall Coverage: 76.72% (+0.15%)

_{This comment will be updated automatically if new data arrives.
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[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	175.26 KiB	173.69 KiB	-1.57 KiB	-0.89%	✅
Rum Profiler	8.08 KiB	8.08 KiB	0 B	0.00%	✅
Rum Recorder	21.23 KiB	21.23 KiB	0 B	0.00%	✅
Logs	56.96 KiB	55.47 KiB	-1.49 KiB	-2.62%	✅
Rum Slim	132.88 KiB	131.39 KiB	-1.49 KiB	-1.12%	✅
Worker	22.99 KiB	22.99 KiB	0 B	0.00%	✅

🔗 RealWorld